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The 35-year-old Haas capped an impressive week by beating Kohlschreiber in 83 minutes for his 14th ATP Tour title and his fourth on home soil. He is the first 35-year-old to win an ATP Tour event since Fabrice Santoro at Newport in 2008.

Now based in Los Angeles, Haas previously won two titles at Halle and one in Stuttgart.

"I can hardly believe that I still managed to win here after such a long career," Haas said.

Haas will rise to 13th in Monday's world rankings. The rejuvenated German has an 18-7 match record this year, reaching the SAP Open final in San Jose, where he lost to Milos Raonic, and knocking out top-ranked Novak Djokovic en route to the semifinals in Miami.